June 2007 - Boost-users - lists.preview.boost.org

[multi-index /mpl] fatal co mpile error when using a tag in VS7.1 wit h SP1
by hongleij＠126.com 28 Jun '07

28 Jun '07

//boost #include <boost/multi_index_container.hpp> #include <boost/multi_index/hashed_index.hpp> #include <boost/multi_index/member.hpp> #include "boost/multi_index/key_extractors.hpp" using namespace ::boost; using namespace ::boost::multi_index; #include <string> struct Peer { std::string userid; int age()const {return age_;} private: int age_; }; struct CPeer:public Peer { int index; }; struct Peer_age_extractor { typedef int result_type; const int operator()(const CPeer& peer)const { return peer.age(); } }; struct userid{}; struct age{}; typedef multi_index_container< CPeer, indexed_by< hashed_unique<tag<userid>,member<Peer,std::string,&Peer::userid> >, hashed_non_unique<tag<age>,const_mem_fun<Peer,int,&Peer::age> >// // hashed_non_unique<const_mem_fun<Peer,int,&Peer::age> > //without a tag will be ok. //hashed_non_unique<tag<age>,Peer_age_extractor > //this line with cause the same question. > > CPeersType; I get this in vs7.1 with sp1: ------ Build started: Project: multi_index1, Configuration: Debug Win32 ------ Compiling... hash_test.cpp f:\boost_1_34_0\boost\mpl\aux_\preprocessed\plain\apply_wrap.hpp(48) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'f:\vs70builds\6030\vc\Compiler\CxxFE\sl\P1\C\main.c', line 1164) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information Build log was saved at "file://g:\cpp\boost\multi_index1\Debug\BuildLog.htm" multi_index1 - 1 error(s), 0 warning(s) yet this can compile well in gcc 3.4. i really don't know why. many thanks for JOAQUIN LOPEZ MU?Z 's past help.;-) 百万玩家同玩的乐园，人气爆发的梦幻西游

2 1

Passing variable no. of arguments in macro
by Prasanta K Chakravarty 28 Jun '07

28 Jun '07

Hi, I have a requirement of passing variable no. of arguments in macro. So, I have build Boost wave library and got .dll and .lib file. But I am not able to use it. Please help me out how to use that one. Thanks & Regards, Prasanta

1 0

Re: [Boost-users] [serialisation]Portable Binary Archives
by Pfligersdorffer, Christian 27 Jun '07

27 Jun '07

boost-users-bounces(a)lists.boost.org wrote: >> If you're talking about portable binary archives for >> Boost.Serialization, there's been talk, but I'm not sure what >> the status is - anyone have an implementation? I'd be willing >> to help / work with someone on it. >> > > That's what I am looking for. We need to get the file sizes down. We > could use text (XML is great for debugging but too big for final > release), but again that has its overheads. We generally don't use > floating point so that may help us. The link I posted does have a > portable implementation which I think uses IEEE754. I just wondered if > there was an official boost:serilisation version; obviously not!! Hello James, there _is_ a portable binary archive provided with the examples but as Robert Ramey points out in the code documentation, it is not complete as it lacks the floating point conversion. But if Johan is willing to fill this gap I am perfectly confident that we could have a comprehensive implementation in a few weeks. That is, if the issue that Dan Leibovich found in the example can be resolved. I follow the portable archive discussion with great interest since I would very much like to use it too. PS @ Cliff: Very interesting post! Do you know about when and if the endian library will enter the official boost release? I would find that useful too. Regards, -- Christian Pfligersdorffer Software Engineering EOS GmbH

6 8

[Serialization] portable binary archive
by Dan Leibovich 27 Jun '07

27 Jun '07

Hi, Few month ago I have started a thread about an issue with the potable binary archive demo: http://lists.boost.org/boost-users/2007/03/26274.php Robert, Were you able to find the exact bug? Thanks in advance Dan

2 2

[serialization] problem with derived classes
by Avery Fay 27 Jun '07

27 Jun '07

Hello, I'm having an issue with serializing derived classes from a base class pointer. I think I've narrowed it down to the simplest possible code. I get an "unregistered class" exception at runtime even though I've registered the derived class with BOOST_CLASS_EXPORT. Here's the code: ---------------------------------------------- main.cpp: #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <sstream> #include "A.hpp" #include "X.hpp" int main() { std::stringstream ss; const A * const test = new X; { boost::archive::text_oarchive oa(ss); oa << test; } A *test2; { boost::archive::text_iarchive ia(ss); ia >> test2; } return 0; } ----------------------------------------------- A.hpp: #pragma once #include <boost/serialization/access.hpp> class A { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & test; } int test; public: A() : test(0) {} virtual ~A() {} }; ----------------------------------------------- X.hpp: #pragma once #include <boost/serialization/base_object.hpp> #include "A.hpp" class X : public A { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & boost::serialization::base_object<A>(*this); } }; ------------------------------------------------ X.cpp: #include "X.hpp" #include <boost/serialization/export.hpp> BOOST_CLASS_EXPORT(X) ----------------------------------------------- As you can see, I don't have BOOST_CLASS_EXPORT in the X.hpp header. This is the way I originally had it but then I got multiple definition link errors when more than one class derived from A. The suggestion in the serialization docs was to move the macro to a .cpp file. Full output when I run this: terminate called after throwing an instance of 'boost::archive::archive_exception' what(): unregistered class Aborted (core dumped) Any help would be appreciated greatly, Avery

1 0

Re: [Boost-users] problem... maybe boost could help
by Ovanes Markarian 27 Jun '07

27 Jun '07

My idea is based on fact that you (program developer or another developer) know what is going to be send. What you are trying to do is erasing the type to some base and that would not work. So you send event must handle derived type and put it correctly to variant. A possible solution would be: template<class EventType_> void sendEvent(EventType_ const& ev) { m_eventContainer = ev; //<- now compiler knows exactly the type of ev m_derivedHelper->dispatchEvent(&m_eventContainer); } Best Regards, Ovanes On Fri, June 22, 2007 21:41, Lukasz wrote: > > Thanks for the fast reply. Your solution looked very good for my problem, so i tried to apply it. >However, there seems to be a problem. At the point when i call dispatchEvent (as in the below >example) is when i have the actual event to be sent. But i still only have a pointer to the base >class and by assigning it to the container, it always gets interpreted as a base event, even when >in reality it's some derived type. > > I tried a couple of approaches. In the first one, my variant contains only the derived type (base class is Event, derived is EventTest) , i.e. > > typedef boost::variant<EventTest> event_container; > > .... > event_container m_eventContainer; > ... > > void sendEvent(Event * event) > { > // Call Helper to dispatch the event to correct type > m_eventContainer = *event; > m_derivedHelper->dispatchEvent(&m_eventContainer); > } > > This won't work. The compiler complains that none of the overloads for >boost::detail::variant::make_initializer_node::apply can convert parameter 2. If i add the base >event type to the variant list, i.e. > > typedef boost::variant<Event, EventTest> event_container; > > it will work, but it will always trigger the processEvent with the base > class type. I haven't found any information as to how boost::variant treats a case of a pointer to >a base class (in this case, i'm not even actually passing the pointer but an object since for >pointers it just doesn't seem to work). Should it be able to automatically convert the type ? If >not, then i guess i'm back to square one, since i still can't cast the event... unless i maybe >misunderstood something ? The code i tried is pretty much what you gave me, with some minor >modifications. > > Thanks in advance for any further assistance. > > Lukasz K. > > [...]

4 8

[filesystem] where is replace_extension
by frederic.bron＠alcan.com 27 Jun '07

27 Jun '07

In the documentation of filesystem (1.34.0), at this position: http://www.boost.org/libs/filesystem/doc/tr2_proposal.html#Header-filesyste… we can read : template <class Path> Path replace_extension(const Path & p, const typename Path::string_type & new_extension); However, in boost_1_34_0.tar.bz2, I cannot find replace_extension in any file. Where is it? Regards, F. Bron Avis : Ce message et toute pièce jointe sont la propriété d'Alcan et sont destinés seulement aux personnes ou à l'entité à qui le message est adressé. Si vous avez reçu ce message par erreur, veuillez le détruire et en aviser l'expéditeur par courriel. Si vous n'êtes pas le destinataire du message, vous n'êtes pas autorisé à utiliser, à copier ou à divulguer le contenu du message ou ses pièces jointes en tout ou en partie. Notice: This message and any attachments are the property of Alcan and are intended solely for the named recipients or entity to whom this message is addressed. If you have received this message in error please inform the sender via e-mail and destroy the message. If you are not the intended recipient you are not allowed to use, copy or disclose the contents or attachments in whole or in part.

2 3

[interprocess] Interprocess and Daniel James'es unordered containers
by Aaron W. LaFramboise 27 Jun '07

27 Jun '07

I'm trying to use Daniel James'es unordered containers, from the vault, with Interprocess: typedef ip::allocator<T, ip::managed_windows_shared_memory::segment_manager> T_allocator; typedef typedef boost::unordered_set<T, T_hash, std::equal_to<T>, T_allocator> T_set; I get this error: boost\unordered\detail\hash_table_impl.hpp(419) : error C2039: 'destroy' : is not a member of 'boost::interprocess::allocator<T,SegmentManager>' The method 'destroy' is missing in CVS, even though its still present in the documentation at <http://cloud.prohosting.com/newfunk/boost/libs/interprocess/doc/html/boost/…>. Is there some other general-purpose allocator that would work here? Why is this method missing?

2 1

Boost.Function and template function
by gast128 27 Jun '07

27 Jun '07

Dear all, I get a crash when I try to wrap a template function with Boost.Function. I use VStudio 2003 sp1. But maybe the used syntax is wrong: #include <boost/function.hpp> struct SomeClass { }; template <typename T> bool func_template(T* p) { return (p != NULL); } void example1() { bool (*pf) (SomeClass*) = &func_template<SomeClass>; boost::function<bool (SomeClass*)> fc1 = &func_template<SomeClass>; boost::function1<bool, SomeClass*> fc2 = &func_template<SomeClass>; boost::function<bool (SomeClass*)> fc3 = pf; fc1(NULL); //crashes fc2(NULL); //crashes also fc3(NULL); //ok } Wkr, me

2 2

Wave lib - MS compatibility issue?
by NeBlackCat 26 Jun '07

26 Jun '07

Firstly hi everybody - this is my first post, and I'm just finding my feet with Boost:Wave. I've built and am playing with the wave driver (wave.exe) on an existing open source project, but I get an "error: ill formed preprocessor directive: import" error with the at a line: #import <msado15.dll> \ rename("EOF","adoEOF") \ no_namespace I thought this might have been an MS compatibility thing, as importing COM type libraries is obviously Windows-specific (and afaik #import does something different in GCC), but I've tried recompiling with BOOST_WAVE_SUPPORT_MS_EXTENSIONS (and have tried lots of other things) and it doesn't make any difference. Google hasn't shown anything up either. Does anyone know if I can turn this error off somehow?

2 1

[Boost.MPL] mpl::find<Types, T> not allowed in with T as template<typename T> argument?
by Manuel Jung 26 Jun '07

26 Jun '07

Hi, I have a short question. ----------- typedef boost::mpl::vector<double, int> Types; template<typename T> void send(){ typedef boost::mpl::find<Types, T>::type iter_T; //Doesn't compile typedef boost::mpl::find<Types, int>::type iter_T_static; //Compiles } ------------ I want the first cersion with my own Template Type. But the compiler gives me somthing like "Not enough Template arguments". (My Compiler outputs me german error messages...) Am i not allowed using my own template arguments with boost::mpl::find? Or what do i have to change? Thanks! Manuel Jung

2 2

how do I use boost::iostreams::code_converter with GNU codecvt<.., ..., __gnu_cxx::encoding_state>?
by 宋浩 26 Jun '07

26 Jun '07

the GNU libstdc++ offers a flexible character encoding convertion primitive (essentially a wrapper for the iconv C API), but in a non-standard partial specialization of codecvt. for example, if I want to use this codecvt, to convert between internal encoding UCS-4LE and external encoding GB18030 (which is China's national standard for Chinese character encoding), I will write // define the codecvt type typedef std::codecvt<wchar_t, char, __gnu_cxx::encoding_state> w_codecvt; // define a std::locale instance only for codecvt purpose std::locale loc(std::locale::classic(), new w_codecvt); const w_codecvt &cvt = std::use_facet<w_codecvt>(loc); // the internal/external character encoding is specified as the // argument to the constructor of __gnu_cxx::encoding_state w_codecvt::state_type state("UCS-4LE", "GB18030"); // use cvt and state cvt.in(state, ...); the problem is, if I want to use this codecvt<.., .., __gnu_cxx::encoding_state> with code_converter, I can't find a way to tell code_convert the encoding names (UCS-4LE, GB18030), seems that code_converter will always use the default constructor of Codecvt::state_type. And if I specify the Codecvt template argument of code_converter to codecvt<.., .., encoding_state>, imbue() will become a no-op, which makes things even worse. BTW: the documentation for GNU libstdc++ codecvt is available here http://gcc.gnu.org/onlinedocs/libstdc++/22_locale/codecvt.html

1 0

wrt my last post with (No Subject)
by jono 26 Jun '07

26 Jun '07

i've solved the problem, thanks. it was me. sorry about the missing subject line. jono

1 0

(no subject)
by jono 26 Jun '07

26 Jun '07

hi all. i'm using boost::state_chart in a serial protocol handler. i have some code that collects characters in each state object by calling Protocol::input(byte) on the state machine, which then dispatches events in response to control bytes and for all other bytes, calls ICharacterInput .... . . state_cast< const ICharacterInput & >().input(c); . . ... which stores the new character in the base class ICharacterInput. i then process the stored characters in the the state's destructor. i've used very similar boost code in a number of protocol handlers and it works great. ...but.. this handler intermittently throws exceptions in boost/statechart/simple_state.hpp when it tries to downcast and delete a pointer to the state. does anybody have any suggestions where i should look to see what's going on? in particular, is the downcast/delete sequence going to be calling any code in my own base class destructors? the destructor in which the exception is thrown (and caught) seems to complete its own instructions without problems. this protocol only uses the EvStartOfHeader and EvEndOfText events. cheers jono poff ==================================================== ==================================================== ===================================== my header file ... struct EvStartOfHeader : sc::event< EvStartOfHeader > {}; struct EvStartOfText : sc::event< EvStartOfText > {}; struct EvEndOfText : sc::event< EvEndOfText > {}; struct EvEndOfTransmission : sc::event< EvEndOfTransmission > {}; struct EvReset : sc::event< EvReset > {}; struct Waiting; struct Decoding; struct Reset; struct RcvHeader; struct RcvText; struct Protocol: sc::state_machine< Protocol, Waiting > , IProtocol { Protocol(); ~Protocol(); virtual const char **input(byte c); }; struct Waiting : ICharacterInput, sc::state< Waiting, Protocol> { Waiting( my_context ctx ); ~Waiting(); typedef sc::transition< EvStartOfHeader, Decoding > reactions; }; struct Decoding: ICharacterInput, sc::state< Decoding, Protocol, RcvText> { Decoding( my_context ctx ); ~Decoding(); typedef sc::transition< EvReset, Waiting > reactions; }; struct RcvHeader : ICharacterInput, sc::state< RcvHeader, Decoding> { RcvHeader( my_context ctx ); ~RcvHeader(); typedef sc::transition< EvStartOfText, RcvText > reactions; }; struct RcvText : ICharacterInput, sc::state< RcvText, Decoding> { RcvText( my_context ctx ); ~RcvText(); typedef sc::transition< EvEndOfText, Waiting > reactions; }; ======================================================= ======================================================= ======================================================= ======================================================= ======== so what happens is: ======== in my dispatch code ... . . case ETX:// End of Text process_event( EvEndOfText() ); . . ======== results in ... . . =========================================== =========================================== == in boost/statechart/simple_state.hpp ... ======== ======== ======== a call to simple_state::exit_impl() {...} ======== results in call to .... . . intrusive_ptr & operator=(T * rhs) { this_type(rhs).swap(*this); return *this; } . . ======== with rhs == 0 ======== then delete throws here ... . . . template< class MostDerived, class Context, class InnerInitial, history_mode historyMode > inline void intrusive_ptr_release( const ::boost::statechart::simple_state< MostDerived, Context, InnerInitial, historyMode > * pBase ) { if ( pBase->release() ) { // The cast is necessary because the simple_state destructor is non- // virtual (and inaccessible from this context) delete polymorphic_downcast< const MostDerived * >( pBase ); } } . . . ============================ ============================ ============================ ============================

1 0

[asio] Any IsConnected() method?
by Sunsawe 25 Jun '07

25 Jun '07

Hi, I would just like to know if there is a simple way to check wether or not a socket is still connected or not. And for a ssl socket? Thanks -- View this message in context: http://www.nabble.com/-asio--Any-IsConnected%28%29-method--tf3978649.html#a… Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

[asio] Assertion failed at run time
by Sawe Sun 25 Jun '07

25 Jun '07

Hi,I'm new to boost and asio. I'm trying to use the ssl support of asio in a simple client.This is the code that i'm using to connect to the server: boost::asio::io_service io_service; boost::asio::ssl::context * ctx; boost::asio::ssl::stream<boost::asio::ip::tcp::socket> * socket; boost::asio::error Error; boost::asio::ip::tcp::resolver resolver(io_service); boost::asio::ip::tcp::resolver::query query(boost::asio::ip::tcp::v4(),hostname,port ); boost::asio::ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve(query,boost::asio::assign_error(Error)); boost::asio::ip::tcp::resolver::iterator end; if(Error) return false; ctx = new boost::asio::ssl::context(io_service, boost::asio::ssl::context::sslv23); boost::asio::ip::tcp::endpoint endpoint = *endpoint_iterator; socket = new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(io_service,*ctx); Error = boost::asio::error::host_not_found; while (Error && endpoint_iterator != end) { socket->lowest_layer().close(); socket->lowest_layer().connect(endpoint,boost::asio::assign_error(Error)); } if (Error) return false; socket->handshake(boost::asio::ssl::stream_base::client,boost::asio::assign_error(Error)); if (Error) return false; else return true;That compiles fine but at run time i have this assertion exception:Assertion failed!Program:... //it is written like thatFile: (PATH)\boost-1_33_1\...\shared_ptr.hLine: 253Expression: px != 0I'm using vs2005. i can't see what is happening because evenif i'm using the "Step Into new Instance" mode to run the program in debug mode, the exception is fired before any step. This is the call stack: msvcr80d.dll!_wassert(const wchar_t * expr=0x0093888c, const wchar_t * filename=0x009388a0, unsigned int lineno=253) Line 384 C CTest.exe!boost::shared_ptr<boost::asio::ssl::detail::openssl_init<1>::do_init>::operator->() Line 253 + 0x1f bytes C++ CTest.exe!boost::asio::ssl::detail::openssl_init<1>::do_init::openssl_locking_func(int mode=5, int n=16, const char * file=0x009401dc, int line=271) Line 83 + 0x37 bytes C++ CTest.exe!_CRYPTO_lock() + 0x81 bytes C CTest.exe!_ssl_load_ciphers() + 0x113 bytes C CTest.exe!_SSL_COMP_get_compression_methods() + 0x5 bytes C CTest.exe!_SSL_library_init() + 0x129 bytes C CTest.exe!boost::asio::ssl::detail::openssl_init<1>::do_init::do_init() Line 57 C++ CTest.exe!boost::asio::ssl::detail::openssl_init<1>::do_init::instance() Line 74 + 0x4a bytes C++ CTest.exe!boost::asio::ssl::detail::openssl_init<1>::openssl_init<1>() Line 96 + 0x5a bytes C++ CTest.exe!`dynamic initializer for 'boost::asio::ssl::detail::openssl_init<1>::instance_''() Line 69 + 0x28 bytes C++ msvcr80d.dll!_initterm(void (void)* * pfbegin=0x00937234, void (void)* * pfend=0x00937f0c) Line 855 C CTest.exe!__tmainCRTStartup() Line 501 + 0xf bytes C CTest.exe!WinMainCRTStartup() Line 403 C kernel32.dll!7c816ff7() [Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll] CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=111) Line 155 + 0x21 bytes C++ CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=115) Line 155 + 0x21 bytes C++ CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=111) Line 155 + 0x42 bytes C++ CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=54) Line 155 + 0x21 bytes C++ CTest.exe!wxFileName::Assign(const wxFileName & filepath={...}) Line 310 C++ CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=111) Line 155 + 0x42 bytes C++ CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=54) Line 155 + 0x21 bytes C++ CTest.exe!wxFileName::Assign(const wxFileName & filepath={...}) Line 310 C++ CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=57) Line 155 + 0x42 bytes C++ CTest.exe!_RSA_padding_check_PKCS1_type_1() + 0xf2 bytes C CTest.exe!boost::asio::ip::basic_endpoint<boost::asio::ip::tcp>::basic_endpoint<boost::asio::ip::tcp>(const boost::asio::ip::address & addr={...}, unsigned short port_num=897) Line 155 + 0x21 bytes C++ 02840448() dbghelp.dll!03020004() Can somebody tell me what i'm doing wrong?Thanks _________________________________________________________________ David Guetta a réuni les sons les plus connus de Messenger dans le Mix Messenger, le son de l’été ! Téléchargez-le gratuitement ! http://specials.divertissements.fr.msn.com/mixmessenger

2 2

[program_options] bad_any_cast problem with strings in variables_map
by Jeffrey Schmidt 25 Jun '07

25 Jun '07

(apologies if this comes through multiple times, I'm having subscription issues) I'm a novice Boost user attempting to use program_options. As far as I can tell from the docs and sample code, this should work (only relevant code included): po::options_description desc("Allowed options"); desc.add_options() ("client", po::value<string>(), "set client name") ("test", "tool test mode, dump command line options only") ; po::variables_map vm; po::store(po::parse_command_line(ac, av, desc), vm); po::notify(vm); if (vm.count("test")) { if (vm.count("client")) cout << "client set to " << vm["client"].as<string>() << "\n"; else cout << "client not set\n"; } However, when I run with "--client testclient --test", the as<string> call generates a bad_any_cast exception. What am I missing or misunderstanding? -- Jeffrey Schmidt, senior software architect MultiAd(r) Creator and Creator Server jschmidt(a)multiad.com

2 4

Question
by question boost 25 Jun '07

25 Jun '07

Hi, using Code Blocks i get the folowing message. ld.exe "Cannot find -lboost_filesystem-mgw-mt-s-l_33_l" How and where can I get this file? Thank You _________________________________________________________________ David Guetta a réuni les sons les plus connus de Messenger dans le Mix Messenger, le son de l’été ! Téléchargez-le gratuitement ! http://specials.divertissements.fr.msn.com/mixmessenger

2 1

Sunpro CC 5.8, -library=stlport4, multi_index, one last time
by Benson Margulies 25 Jun '07

25 Jun '07

I beg the indulgence of the maintainers to clarify the support intentions here and then I'll go back to my cave. The facts are: 1) The regression tests run reasonably on CC 5.8, with or without -library=stlport4 2) I have a seemingly simple example of using multi_index that won't compile with CC 5.8 unless I'm using -library=stlport4. The compile error, for what it's worth, does not point to one of the weaknesses of the 'old Sun STL' in any obvious way. But it could easily be that some ifdef that is trying to compensate for the old STL is in turn creating the conditions for the failure. (I'm not entirely sure about #1.) The question is: "Is it the intention of the maintainers to support CC 5.8 without -library=stlport4?" If the answer is 'yes', then I will nudge to get this case included in the regression, and I will invest some time in trying to unscrew the inscrutable error. If the answer is 'no', then I will concentrate on moving our Apatosaurus of a code-base to getting itself compiled with -library=stlport4 as soon as I can, and defer use of boost until that can accomplish itself.

2 2

tokenizer
by david bautista garcia 25 Jun '07

25 Jun '07

Hello: somebody can say me that it makes this code, mainly the option : sep (: , "", boost:: keep_empty_tokens) typedef boost::tokenizer<boost::char_separator<char> > tokenizer; boost::char_separator<char> sep(":", "", boost::keep_empty_tokens); tokenizer tokens(str, sep); tokenizer::iterator tok_iter = tokens.begin(); //cout << "TOKEN " << (*tok_iter) << endl; the input is: BSIC=4-6,BCCHFREQ=784,SYSID=DCS1800,MSTXPMAXGSM=<NULL>,MSTXPMAXDCS=0,MSTXPMAXPCS=<NULL>,CELLGLID="214"-"03"-6004-1519,RACODE=137,RACOL=0,GRXLAMI=6,GMSTXPMAC=15; What's de output? Thanks -------------------------------------------------------------------------------------------- ¿Ya sabes con quién vas? ¿Héroe o Villano? Prepárate para la batalla final en http://friki.ozu.es -------------------------------------------------------------------------------------------- Correo enviado desde http://www.ozu.es

1 0

[Preprocessor] Expand to nothin - BOOST_PP_SEQ_PUSH_BACK
by Manuel Jung 24 Jun '07

24 Jun '07

Hi The BOOST_PP_SEQ_PUSH_BACK Macro expands to the seq with the extra element. But i don't want it to expand. I want to use the sequence later instead. How can i supress the expanding? I looked through the docs, but didn't find the right clue. I'm new too Preprocessorprogramming, so please excuse, if my question is stupid. Not the easiest thing, starting Preprocessor and Metaprogramming from nothing but the docs. Kind Regards Manuel Jung

2 2

Boost.graph : 3D graphics primitives hierarchy (scenegraph)
by Nicholas Yue 23 Jun '07

23 Jun '07

Hi, I am considering using boost::graph to represent a DAG of 3D graphics primitive hierarchy, much like a scenegraph in games with the exception that no drawing code is embedded with this structure. The DAG is important in that I will be injecting changes to certain nodes which than affects/updates all it's child nodes. The intention is to allow me to write tools to work with this hierarchy. Eventually, these geometries may be turned into renderable entities (via some visitor iterator) for visualization/verification but that is not the main purpose. I am very new to boost::graph and hope someone can point me at information or open source project that is relevant to my exploration. Regards

4 4

Dijkstra Visitor - Accessing the priority queue
by Jonas Gabriel 23 Jun '07

23 Jun '07

Good morning, I'm trying to make a single pair shortest path function using the goal-directed search technique based on dijkstra_shortest_paths and Visitors. In some point when the target vertex is processed, I would like to exit dijkstra_shortest_paths.To do that I 'm thinking trying to empty the priority queue. Can I access the priority queue inside a visitor using something like an extern declaration, since none of the Dijkstra Visitor's methods gets the priority queue as an argument ? With regards, Jonas Gabriel

2 1

How to "splice" function arguments?
by Zeljko Vrba 23 Jun '07

23 Jun '07

I have the following situation with parallel overloaded functions: void f(X *x) | void f(int g, X *x) { { | { Impl<false>::f(-1, x); | Impl<true>::f(g, x); } | } template<bool F> struct Impl { typedef Detail<F> detail; void f(int g, X *x) { // CODE X *t = detail::smth(g, x); // CODE } }; In the "false" case, the argument g of Impl::f is not used and I want to get rid of it in compile-time as an optimization. The rest of the CODE is completely identical. In other words, I want to transform the "false" case, at compile-time, to the following: void f(X *x) { Impl<false>::f(x); } template<> struct Impl<false> { typedef Detail<false> detail; void f(X *x) { // CODE X *t = detail::smth(x); // CODE } }; Now, I could manually duplicate all of the code in Impl::f(int, X*) into Impl::f(X*) and remove the extra argument in the call to detail::smth. Doing such specialization manually seems _very_ inelegant and error-prone (I'm not really a fan of copy-pasting the code :)) Is there a better way; ie. doing it automatically? If so, how? It is acceptable to manually overload the top-level f() function, as it has no other code except the dispatch to Impl::f. I want full compile-time solution; ie. I do not want the stack space for the unneeded integer parameter ever to be allocated. [The code for the "false" case will be called on every function invocation, so YES, performance DOES matter even without apriori profiling.] Signatures in the implementation of Impl and Detail are flexible and I can change them if it helps solving the problem. The only thing that I do not want to change are the signatures of top-level f() function overloads. Thanks, Zeljko.

2 2

[boost.test] Provoking a core-dump
by Zeljko Vrba 23 Jun '07

23 Jun '07

I'm using the boost minimal testing facility - mostly because I do not want to build full boost. [I spent one day about an hour trying to figure out how to build a 64-bit version on Solaris with SunCC and failed. So I gave up. Besides, minimal testing facility is enough for me.] Is it possible to configure BOOST_CHECK or BOOST_REQUIRE to behave as assert? BOOST_REQUIRE throws an exception which eventually gets caught and the test just prints "failed". That's not what I want. I want that the message is printed and abort() immediately called so that I can inspect the core-dump and debug the problem. A quick&dirty fix is to add something like the following on top of each test: #ifdef BTEST_OVERRIDE #define BOOST_REQUIRE assert #define BOOST_CHECK assert #endif Is there another possibility? Ideally, there would be a command-line switch to toggle this behaviour at runtime. So the first run of tests in "normal" mode just gives a quick overview of everything, and another "diagnostic" mode (running with a hypothetical "-abort" switch) calls abort() as soon as any CHECK or REQUIRE fails.

2 1